Boiler.



MM/mm gy @QBWZ J. T. BROWN.

BOILER.

APPLICATION FILED JUNE 3, 191-1.

Patented Apr. 2, 1912.

3 SHEETS-SHEET 1.

mLUMnIA PLANOGRAPH co, WASHINGTON, b. c.

J. T. BROWN.

BOILER.

APPLIOATION FILED JUNE-3, 1911. 1,021,759. I Patented Apr. 2, 1912.

3 SHEETS-SHEET}. V

COLUMBIA PLANDGRAPH ,co., WASmNGwN. D. C.

' J. T. BROWN.

BOILER.

APPLIOATIONAIILED JUNE 3, 1911.

Patented Apr. 2, 1912.

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J'AMES '1. BROWN, or nn'rno'rr, MICHIGAN.

BOILER.

Specification of Letters Patent.

Patented Apr. 2, 1912.

Application filed June 3, 1911. Serial No. 630,968.

7 To all whom it may concern:

Be it known that I, JAMES T. BROWN, citizen of the United States of America, residing at Detroit, in the countyof Wayne and State of Michigan, have invented certain new and useful Improvements in Boilers, of which the following is a specification, reference being had therein to the accompanying drawings. r

In the usual construction of furnaces and boilers of any type, there is a large amount of unconsumed gases that escape and are wasted, the fuel itself, unless most carefully stoked. is frequently only partially consumed and a large quantity of smoke results. Various devices have been contrived for consuming the smoke that usually take the form of attachments and impede to a greater or less extent the furnace draft and therefore tend to lower the boiler efliciency.

This invention relates to a boiler which is so disposed and arranged that the gases from the partially unconsumed or coking fuel together with the smoke therefrom are ignited and the resultant heat utilized in the generator, provision also being made by an arrangement of the fuel bed whereby a fresh fire or supply of fuel does not affect the smoke consuming and gas burning qualities of the apparatus.

Another feature of the invention is the arrangement of the water tubes to present as large a surface as possible in direct contact with the heat currents and gases from the fuel beds.

The invention consists in the matters pointed out in the appended claims.

In the drawings, Figure 1 is a view partially in elevation and partially in longitudinal section of a boiler and boiler setting embodying features of the invention; Fig.

2 is a plan view thereof, partially broken away and in section; Fig. 3 is a view in front elevation of the structure with the front casing removed and broken away;

and Fig. 4 is-a view taken on or'about line IVIV of Fig. 2.

As herein indicated a tubular boiler shell 1 has a forward extension or drum 2 which is divided by a substantially diametrical fire wall 3 extending from the base of a fire chamber between the usual side walls 4 of a boiler setting. Grate bars 5 are supported 5 in the usual manner in each compartment i interior.

wall 3. The boiler is provided with flues 6 extending from end to end thereof on either side of the fire wall 3. The space between the side walls 4 at the rear end of the shell is likewise divided by a fire wall extending to the back wall 8 with an overhead bridge or deflector 9. A breeching 1O terminating in the smoke flue 11 is mounted over the forward shell 2.

Each fire compartment is closed at its inner end by a transversely disposed bridge wall 12 while the space at the rear of the boiler is likewise shut in by a back bridge wall 13. A hollow-walled horizontal flue 14 is disposed obliquely below the shell with its forward end leading from one of the forward combustion chambers to the return chamber at the rear of the boiler on the other end, the extremities of the flue passing through the bridges 12 and 13 in which it is set, Waterlegs 15 connect the water space in the flue wall with the boiler shell 'Another'flue 16 below the flue 14 connects the other combustion chamber with the other returncompartment and'has the water'space in its hollow wall in communication with the shell interior through water legs 17.

A damper or closure '18 controls anopening through the wall of the extension 2 of the shell above the combustion chamber with which the flue 14 is in communication and a similar closure or damper 19 regulates an opening through the extension above the other combustion chamber. A smoke damper 20 maybe used to close an opening in the extension 2 on one side of the fire wall 3 into the back breeching 10 and a corresponding damper 21 on the other side of the fire wall 2- may likewise be used to shut off an opening through the extension 2' into the breeching or smoke flue. The dampers may be of any preferred type and are herein shown as operated by turning hinge pins 22 on which they are mounted, that mayextend through the front casing of the furnace with appropriately disposed levers, handles or like means for convenient manipulation.

In operation, fires having been started on both grates, the dampers may be set as in Fig. 3 so that the gas or smoke of combustion on the left hand of the fire wall travof the raised damper 18 onto the top of the fire bed in the opposite combustion chamber where unconsumed gases become ignited and are then drawn back through the other smoke flue 14 and finally escape through the return flues to the left of the wall 3 and the upper smoke damper 21 to the stack. As soon as a fresh charge of fuel is placed upon the grates to the right of the fire wall 3 the damper 18 is closed, the damper 20 opened and on the opposite side the damper 21 is closed and the lower closure 19 opened. This causes a reversal of draft through the furnace on to the bright fire in the other bed which insures combustion of the otherwise unignited gases. By thus feeding the fires alternately complete combustion of all solids which otherwise form smoke and of the gases arising from the coking fuel is obtained while the disposition of the flues of the boilers is such that the water presents a very large surface to the radiating walls of the flues and water tubes.

The space between the front and back bridges gives ample opportunity for inspection, repair and cleaning of the parts and the construction is simple and effective.

Obviously, changes in the details of construction may be made without departing from the spirit of the invention and I do not care to limit myself to any particular form or arrangement of parts.

What I claim is:

l. The combination of a boiler setting having a pair of combustion chambers and a pair of return chambers with a boiler shell having internal flues connecting each combustion chamber with the corresponding return chamber, a pair of external hollowwalled flues each connecting a combustion chamber with the opposite chamber, and water legs connecting the walls of the latter flues with the shell interior.

2. The combination of a boiler setting having a pair of combustion chambers and a pair of return chambers with a boiler shell having internal flues connecting each combustion chamber with the corresponding return chamber, a pair of external hollowwalled flues each connecting a compartment with the opposite chamber, and manually operable means in each combustion chamber for cutting off communication between the adjacent external flue and the shell flues.

3. The combination of a boiler setting having outer walls and forward and back bridge walls, a central fire wall dividing the space in front of the forward bridge into the combustion chambers, a rear fire wall dividing the space behind the back bridge wall into two return chambers with a boiler shell spanning the bridge walls and having internal flues connecting each combustion chamber with the corresponding return chamber, a pair of external hollow-walled flues each extending through the bridge walls and connecting a combustion chamber with the opposite return chamber, and water legs connecting the Water walls of the external flues with the boiler shell interior.

4. The combination of a boiler setting having outer walls and forward and back bridge walls, a central fire wall dividing the space in front of the forward bridge into two combustion chambers, a rear fire wall dividing the space behind the back bridge wall into two return chambers with a boiler shell spanning the bridge walls and having internal flues connecting each combustion chamber with the corresponding return chamber, a pair of external hollow-walled flues each extending through the bridge walls and connecting a combustion chamber with the opposite return chamber, water legs connecting the water walls of the external flues with the boiler shell interior, and means in each combustion chamber controlling communication between the companion external flue and the shell flues opening into said chamber.

5. The combination of a boiler setting having a pair of combustion chambers and a pair of return chambers with a boiler shell having internal flues connecting each combustion chamber with the corresponding re turn chamber, a pair of external hollowwalled flues each connecting a compartment with the opposite chamber, manually 0perable means in each combustion chamber for cutting off communication between the adjacent external flue and the shell flues, a

breeching opening from the combustion chamber and manually operable means for controlling communication between each combustion chamber and the breeching.

6. The combination of a boiler setting having outer walls and forward and back bridge walls, a central fire wall dividing the space in front of the forward bridge into the combustion chambers, a rear fire wall dividing the space behind the back bridge wall into two return chambers with a boiler shell spanning the bridge walls and having internal flues connecting each combustion chamber with the corresponding return chamber, a pair of external hollow-walled flues each extending through the bridge walls and connecting a combustion chamber with the opposite return chamber, water legs connecting the water walls of the external flues with the boiler shell interior, means in each combustion chamber controlling communication between the companion external flue and the shell flues opening into said chamber, a breeching opening from the combustion chamber and manually operable means for controlling communication between each combustion chamber and the breeching.

having outer walls and forward and back bridge walls, a central fire wall dividing the space in front of the forward bridge into two combustion chambers, a rear fire wall dividing the space behind the back bridge wall into two return chambers,- with a boiler shell spanning the bridge walls, internal shell fiues connecting each combustion chamber with the corresponding return chamber, an extension of the shell into the combustion chambers divided by the central firewall into a pair of compartments, a smoke breeching, external water walled flue's each connecting a combustion chamber with the opposite return chamber, a damper in the extension in each combustion chamber between the shell fines and adjacent outer flue, and a damper in the extension in each combustion chamber controlling an opening into the breeching.

In testimony whereof I affix-my signature in presence of two witnesses.

JAMES T.- BROWN. Witnesses:

O. R. STIoKNEY, A. M. SHANNON.

Copies of this patent may be obtained for'five cents each, by addressing the Commissioner of Patents. Washington, II). 0. 

